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Turned out to be the heater control valve. Good to know about how much they are supposed to turn though. Thanks for the reply.

I'm thinking it's the blend actuator, how much should the actuator turn when activated? It looks to move about a quarter of a turn. I do hear an audible difference in sound when switched from cold to hot but no difference in temperature. One of the hoses on the core is noticeably cooler for a...